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Home >> Ford >> 1991 >> Explorer 2D Utility, RWD, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Basic Testing >> Electronic DISTRIBUTORLESS Ignition System (EDIS) 4.0L Engine >> Test 49, Check C1, C2 & C3 At Coil Pack
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Test 49, Check C1, C2 & C3 At Coil Pack

Turn key off, and connect ECA. Set DVOM to 20-volt AC scale. Start engine, and measure voltage between breakout box pins No. J7 (BAT -) and J3 (C1), J7 and J6 (C2) and J7 and J10 (C3). If any settled voltage is less than one volt, replace coil pack. Remove all test equipment, and reconnect all components. Clear Continuous Memory, and check for fault codes. If all settled voltage readings are greater than one volt, go to next test.